420867681 has 16 divisors (see below), whose sum is σ = 611976960. Its totient is φ = 255715200.

The previous prime is 420867673. The next prime is 420867721. The reversal of 420867681 is 186768024.

It is not a de Polignac number, because 420867681 - 2³ = 420867673 is a prime.

It is a super-2 number, since 2×420867681² = 354259209820635522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420867661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65220 + ... + 71381.

It is an arithmetic number, because the mean of its divisors is an integer number (38248560).

Almost surely, 2^420867681 is an apocalyptic number.

It is an amenable number.

420867681 is a deficient number, since it is larger than the sum of its proper divisors (191109279).

420867681 is a wasteful number, since it uses less digits than its factorization.

420867681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136696.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 420867681 is about 20515.0598585527. The cubic root of 420867681 is about 749.4025944908.

The spelling of 420867681 in words is "four hundred twenty million, eight hundred sixty-seven thousand, six hundred eighty-one".